Classification of models

Wooden model, crystal model, ABS resin model, metal model, etc.

Models can have many forms, and there is no unified classification principle. According to the expression form of the model, it can be divided into physical model, mathematical model, structural model and simulation model. Also known as entity model, it can be divided into physical model and analogy model.

(1) Physical model: Physical model made according to similarity theory, scaled down (or enlarged or the same size as the original system), such as airplane model, hydraulic system experimental model, building model and ship model in wind tunnel experiment.

② Analogy model: In systems with different physical fields (mechanics, electricity, heat, fluid mechanics, etc.). ), each variable sometimes obeys the same law, according to which analogy and analogy model with completely different physical meanings can be made. For example, under certain conditions, the pressure response of a pneumatic system composed of a throttle valve and a gas volume has a similar law to the output voltage characteristics of a circuit composed of a resistor and a capacitor, so the pneumatic system can be simulated by a circuit that is easy to experiment. Definition: Industrial model, commonly known as hand board, first board model and rapid prototyping, is mainly produced by numerical control processing, laser rapid prototyping and silicone mold in small batches. Industrial models are widely used in the design and development stage of new industrial products, and the physical models that are in line with the design can be processed in the shortest time. Designers carry out product appearance confirmation and functional testing, so as to improve the design scheme, reduce the development cost, shorten the development cycle, and quickly gain customer recognition.

Scope of application: digital products (mobile phones, telephones, USB headsets, cameras). Medical products for household appliances (TV sets, computers, air conditioners, vacuum cleaners, printers, copiers, washing machines, hot water kettles, massagers, and B-ultrasound instruments). 3. Auto parts (dashboard, door, air conditioner, DVD lamp, reversing disc, bumper).

Today's industrial model is not as simple as scaffolding. From digital products, home medical products and auto parts to large mechanical models and engineering models. It is larger than the building model and the technical difficulty coefficient is further improved. A model represented by a program running on a digital computer, an analog computer or a hybrid computer. Physical models, mathematical models and structural models can usually be converted into simulation models by using appropriate simulation languages or programs. As for the influence of different control strategies or design variables on the system, or the possible influence of the system after some disturbances, it is best to experiment on the system itself, but this is not always feasible. There are many reasons, such as: the experiment may be expensive; The system may be unstable, and the experiment may destroy the balance of the system and cause danger; The time constant of the system is very large, and the experiment takes a long time; The system to be designed does not exist yet. In this case, it is effective to establish the simulation model of the system. For example, the biological methanation process is an anaerobic fermentation process, and methane is produced by bacterial decomposition. According to the knowledge of biochemistry, the simulation model of the process can be established, the optimal steady-state value of the process can be found by computer, and various start-up methods can be studied. It is almost impossible to complete these studies on the system itself, because it is technically difficult to keep the process in a stable state, and the start-up process of biomethanation reaction is very slow and takes several weeks. However, if the model is simulated on a computer, the start-up process of methanation reaction only takes a few minutes.

Digital model, also known as digital sandbox, multimedia sandbox, digital sandbox system, etc. It is a three-dimensional modeling, simulating a three-dimensional building, scene and effect. It can freely wander, gallop, fly and zoom in the digital scene, from whole to part and then from part to whole without any restrictions. Three-dimensional digital city and virtual model room, traffic bridge simulation, three-dimensional visualization of garden planning, three-dimensional simulation of ancient buildings, simulation demonstration of mechanical industrial equipment, etc., which are constructed by using three-dimensional digital technology, play the role of display, explanation, command and explanation with the help of pc and display system. Multimedia sand table is a new way to express the dynamic physical model by using projection equipment combined with physical planning model, making dynamic plane animation through accurate alignment and projecting it on the physical sand table.

By combining sound, light, electricity, image, three-dimensional animation and computer program control technology with the solid model, the digital model can fully reflect the characteristics of the displayed content and achieve vivid and diverse dynamic visual effects. It is a brand-new experience for tourists, and it can produce a strong * * * sound. Digital model is a new concept put forward by Shenzhen Saiye Model, the largest and earliest model design and production company in China. Its self-developed digital-analog technology has been patented by the state, and it has been reflected in its Shaoguan planning department and Shaoguan master plan project. Digital model, a new term, will replace the traditional architectural model in the near future and become another new highlight of the exhibition content. Digital model goes beyond the monotonous physical model sand table display, and adds multimedia automation programs on the basis of traditional sand table, which fully shows rich dynamic visual effects such as location characteristics and seasonal changes. It is a brand-new experience for customers and can produce a strong visual shock. Customers can also choose to watch the corresponding display content through the touch screen, which is simple and convenient, and greatly improves the interactive effect of the whole display.